Rodney,
First off: [#welcome] to the forum! Good to have you aboard! [:)]
As others have already said, picking a DCC system is a personal choice. Even the suggestions and recommendations you get here will be “tainted” by personal bias.
Although a few here on the forum would disagree with me, not any one DCC system is the right choice for everyone. Each DCC system has its pros and cons, its pluses and minuses. You need to determine which one will best meet your current and future needs and preferences.
You’ve already put together a list of your givens:
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For a medium-size layout
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For you and your grandkids (ages 6 & 7)
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Can handle turnouts, lights, etc.
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Can purchase online
so you’re off to a good start.
Any of the top brands (Digitrax, EasyDCC, Lenz, MRC, NCE) will do what you are wanting to accomplish with your layout. However, you will find that some might accomplish in a way (or ways) that makes more sense to you.
Rodney, I initially went with the Bachmann E-Z Command. It’s a good, basic, no-frills, albeit “limited” 1-amp DCC system. Even though it met my initial needs, I would not recommend it for you because of the list you’ve given so far.
Early last year, I bought the NCE Power Cab because I was interested in a more sophisticated DCC system. One of the primary reasons I chose the Power Cab was because it was very intuitive looking, as well as to operate. I have not regretted choosing either of those DCC systems.
Rodney, if you’re interested in reading about the NCE Power Cab, I wrote a review about it on the forum, after it first came out in February 2006. It includes my initial thoughts and impressions of the Power Cab, pictures,